BMR & TDEE Calculator
Calculate your basal metabolic rate (BMR) and total daily energy expenditure (TDEE) based on age, gender, weight, height, and activity level. Free Harris-Benedict BMR calculator with detailed breakdowns and charts.
About This Calculator
The BMR & TDEE Calculator helps you determine your daily calorie needs using the scientifically validated Harris-Benedict equation. Whether you want to maintain, lose, or gain weight, knowing your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) is essential for setting the right calorie targets. This calculator is designed for adults aged 18 and above who want evidence-based guidance on their daily energy requirements.
Your BMR is calculated using the Harris-Benedict equation: for men, BMR = 66.5 + (13.75 × weight in kg) + (5.003 × height in cm) − (6.75 × age); for women, BMR = 655.1 + (9.563 × weight in kg) + (1.850 × height in cm) − (4.676 × age). Your TDEE is then computed by multiplying your BMR by an activity factor — 1.2 for sedentary lifestyles, up to 1.9 for extra active individuals. The calculator also shows your calorie needs across all five activity levels in the breakdown table.
Why BMR and TDEE Matter
Your BMR accounts for 60–75% of your total daily calorie burn and represents the energy your body needs for basic functions like breathing, circulation, and temperature regulation. TDEE adds the calories burned through physical activity and digestion. Knowing both numbers helps you make informed decisions about nutrition, exercise, and weight management.
Regional Notes
India (ICMR): The Indian Council of Medical Research adapts global BMR formulas for Indian populations, accounting for differences in body composition and dietary patterns. Typical BMR for Indian adults ranges from 1,200–1,600 kcal/day depending on age and gender.
United States (USDA): The Dietary Guidelines for Americans use BMR and TDEE calculations as the foundation for the Dietary Reference Intakes (DRIs). The average American adult's TDEE ranges from 2,000–2,500 kcal/day for women and 2,500–3,000 kcal/day for men.
United Kingdom (NHS): The NHS Eatwell Guide recommends 2,000 kcal/day for women and 2,500 kcal/day for men as general targets, but individual TDEE can vary significantly. The NHS advises using BMR calculations for personalized weight management plans.
Frequently Asked Questions
How does the BMR and TDEE calculator work?
The calculator uses the Harris-Benedict equation to estimate your Basal Metabolic Rate (BMR) — the calories your body needs at complete rest. For men: BMR = 66.5 + (13.75 × weight in kg) + (5.003 × height in cm) − (6.75 × age). For women: BMR = 655.1 + (9.563 × weight in kg) + (1.850 × height in cm) − (4.676 × age). Your Total Daily Energy Expenditure (TDEE) is then calculated by multiplying your BMR by an activity factor ranging from 1.2 (sedentary) to 1.9 (extra active).
What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while at complete rest. TDEE (Total Daily Energy Expenditure) includes your BMR plus all additional calories burned through physical activity, digestion, and daily movement. TDEE is your true daily calorie requirement for maintaining your current weight.
Is the Harris-Benedict equation accurate?
The Harris-Benedict equation is one of the most widely used and validated BMR formulas. First published in 1918 and revised in 1984, it provides a reasonable estimate for most people. However, individual metabolism can vary based on muscle mass, genetics, hormonal factors, and medical conditions. For personalized medical advice, consult a registered dietitian or healthcare provider.
How do I use BMR and TDEE for weight loss?
To lose weight, consume fewer calories than your TDEE. A deficit of 500 calories per day typically leads to about 0.5 kg (1 lb) of weight loss per week. Never eat below your BMR, as your body needs those calories for essential functions. Combine your calorie deficit with regular exercise for sustainable results.
What activity level should I choose?
Sedentary (1.2): little or no exercise, desk job. Lightly active (1.375): light exercise 1-3 days/week. Moderately active (1.55): moderate exercise 3-5 days/week. Very active (1.725): hard exercise 6-7 days/week. Extra active (1.9): very hard daily exercise plus physical job. Be honest — most people overestimate their activity level.
What is a normal BMR range?
The average BMR is about 1,400 kcal/day for women and 1,700 kcal/day for men. Your BMR depends on age, gender, weight, height, and body composition. Muscle tissue burns more calories at rest than fat tissue, so individuals with higher muscle mass typically have a higher BMR.
Does the BMR formula differ by country?
The Harris-Benedict and Mifflin-St Jeor equations are used globally. India's ICMR, the US Dietary Guidelines, and the UK's NHS all reference these formulas. The Mifflin-St Jeor equation (1990) is slightly more accurate for modern populations and is used by many clinical dietitians in all three countries.